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@Article{MauryaMeFoPaLaMi:2018:DeReSt,
               author = "Maurya, Ved P. and Meju, Maxwell A. and Fontes, Sergio L. and 
                         Padilha, Ant{\^o}nio Lopes and La Terra, Emanuele F. and 
                         Miquelutti, Leonardo G.",
          affiliation = "{Observat{\'o}rio Nacional} and Petronas Upstream Exploration, 
                         Kuala Lumpu and {Observat{\'o}rio Nacional} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Observat{\'o}rio 
                         Nacional} and {Observat{\'o}rio Nacional}",
                title = "Deep Resistivity Structure of Basalt-Covered Central Part of 
                         Paran{\'a} Basin, Brazil, From Joint 3-D MT and GDS Data 
                         Imaging",
              journal = "Geochemistry, Geophysics, Geosystems",
                 year = "2018",
               volume = "19",
               number = "7",
                pages = "1994--2013",
                month = "July",
             abstract = "The deep structure beneath the basalt-covered sediments of 
                         Paran{\'a} basin is not well understood. Magnetotelluric (MT) 
                         broadband (1,000 to 0.001 Hz) data recorded at 296 selected 
                         stations along three new survey lines were first inverted in three 
                         dimensions to reveal the local scale resistivity structure of the 
                         central part of the basin where there are three deep exploration 
                         wells with resistivity logs for model validation. The 3-D MT 
                         inversion model correctly identified the resistive (>100 
                         \Ωm) flood basalts and postvolcanic cover layer, the 
                         underlying electrically conductive (~10 \Ωm) sediments, and 
                         the highly resistive (>1,000 \Ωm) crystalline basement at 
                         the well locations and provides a reliable average crustal 
                         resistivity structure consisting of ~2024 km thick highly 
                         resistive upper crust and ~20 km thick conductive lower crust 
                         above a resistive mantle. Subsequent basin-scale joint inversion 
                         of highest quality MT data sets (261 stations) and geomagnetic 
                         depth sounding array data imaged two prominent subparallel belts 
                         of N-S and NNE-SSW trending steep conductors in the deep crust and 
                         upper mantle, one located directly beneath the present-day axis of 
                         thickest sedimentary deposits in the basin and another near the 
                         coastal location where dolerite dyke swarms intrude the 
                         outcropping Precambrian basement. Other roughly orthogonal bands 
                         (E-W to NW-SE) of linear crustal conductors radiate from these two 
                         main belts. The resulting networks of steep conductors at upper to 
                         midcrustal level seem to mark the fossil plumbing system of 
                         Paran{\'a} magmatic province and are interpreted as preexisting 
                         shear zones exploited by the voluminous Early Cretaceous magmatism 
                         in the region.",
                  doi = "10.1029/2017GC007314",
                  url = "http://dx.doi.org/10.1029/2017GC007314",
                 issn = "1525-2027",
             language = "en",
           targetfile = "maurya_deep.pdf",
        urlaccessdate = "30 nov. 2020"
}


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